邻甲酚加氢脱氧还原型催化剂的实验研究

以邻甲酚为生物质热解油模型化合物,研究了几种还原型加氢催化剂的催化脱氧性能的差异。采用孔饱和浸渍法制备了Mo/Al₂O₃、CoMo/Al₂O₃和CoMoEDTA/Al₂O₃加氢脱氧催化剂,采用H₂ -TPR、XRD对它们进行了表征;在H2气氛下对催化剂进行了还原,并在连续流动固定床加氢微反装置中,考察了邻甲酚在不同还原态催化剂催化下加氢脱氧反应的转化率和产物的选择性。结果表明,在相同的加氢反应条件下,CoMoEDTA/Al₂O₃的催化活性和稳定性均比Mo/Al₂O₃和CoMo/Al₂O₃催化剂高;在反应过程中,Mo/Al₂O₃催化剂表现出较高的直接脱氧选择性,而CoMo/Al₂O₃和CoMoEDTA/Al2O3催化剂表现出较高的加氢脱氧选择性。

Research on the Hydrodeoxygenation of o-Cresol Over Reduced Catalysts

The hydrodeoxygenation performance of reduced catalyst was studied with o-cresol as model compound of bio pyrolysis oil. Mo/Al₂O₃, CoMo/Al₂O₃ and CoMoEDTA/Al₂O₃ hydrodeoxygenation catalysts were prepared by pore volume co-impregnation method. The catalysts were characterized by means of H₂ TPR and XRD, and reduced by H₂ at atmospheric pressure. The hydrodeoxygenation activity and selectivity of o-cresol over these different reduced catalysts were investigated in a continuous flow fixed-bed micro-reactor. The results showed that compared with Mo/Al₂O₃ and CoMo/Al₂O₃ catalyst, CoMoEDTA/Al₂O₃ catalyst exhibited higher catalytic activity and stability at the same evaluation conditions. In addition, the direct deoxygenation selectivity over Mo/Al₂O₃catalyst was higher, while the hydrodeoxygenation selectivities over CoMo/Al₂O₃ and CoMoEDTA/Al₂O₃ catalysts were higher.